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101 lines
2.1 KiB
Markdown
101 lines
2.1 KiB
Markdown
# Name-based (reverse) Routing
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All routes which have `:name` route data defined, can also be matched by name.
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Given a router:
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```clj
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(require '[reitit.core :as r])
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(def router
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(r/router
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["/api"
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["/ping" ::ping]
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["/user/:id" ::user]]))
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```
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Listing all route names:
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```clj
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(r/route-names router)
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; [:user/ping :user/user]
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```
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No match returns `nil`:
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```clj
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(r/match-by-name router ::kikka)
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nil
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```
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Matching a route:
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```clj
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(r/match-by-name router ::ping)
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; #Match{:template "/api/ping"
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; :data {:name :user/ping}
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; :result nil
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; :path-params {}
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; :path "/api/ping"}
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```
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If not all path-parameters are set, a `PartialMatch` is returned:
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```clj
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(r/match-by-name router ::user)
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; #PartialMatch{:template "/api/user/:id",
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; :data {:name :user/user},
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; :result nil,
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; :path-params nil,
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; :required #{:id}}
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(r/partial-match? (r/match-by-name router ::user))
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; true
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```
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With provided path-parameters:
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```clj
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(r/match-by-name router ::user {:id "1"})
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; #Match{:template "/api/user/:id"
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; :data {:name :user/user}
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; :path "/api/user/1"
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; :result nil
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; :path-params {:id "1"}}
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```
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Path-parameters are automatically coerced into strings, with the help of (currently internal) Protocol `reitit.impl/IntoString`. It supports strings, numbers, booleans, keywords and objects:
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```clj
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(r/match-by-name router ::user {:id 1})
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; #Match{:template "/api/user/:id"
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; :data {:name :user/user}
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; :path "/api/user/1"
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; :result nil
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; :path-params {:id "1"}}
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```
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There is also a exception throwing version:
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```clj
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(r/match-by-name! router ::user)
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; ExceptionInfo missing path-params for route /api/user/:id: #{:id}
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```
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To turn a Match into a path, there is `reitit.core/match->path`:
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```clj
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(-> router
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(r/match-by-name ::user {:id 1})
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(r/match->path))
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; "/api/user/1"
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```
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It can take an optional map of query-parameters too:
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```clj
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(-> router
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(r/match-by-name ::user {:id 1})
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(r/match->path {:iso "möly"}))
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; "/api/user/1?iso=m%C3%B6ly"
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```
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